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Silane-containing corrosion protection coatings

Inactive Publication Date: 2010-01-21
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0077]The process of the present invention is a substitute for conventional processes for metal pretreatment with heavy metals, in particular Cr6+, with a low VOC water-based system. The process of the present invention is safer and environmentally friendly. The process of the present invention is a low temperature process, preferably performed at about 60° C. (140° F.) and below, instead of high temperatures. Thus, this process is advantageous from the view point of cost savings.
[0078]In addition, the process of the present invention, can simplify the anticorrosion metal treatment by using, in on

Problems solved by technology

Corrosion damages of metal materials and metal parts are of significant economic importance.
These metals have health and ecological risks, and thus alternatives are being searched.
Such formulations are used in the industrial production in only very few circumstances due to the fact that industrial manufacturing does not have the capabilities to handle solvent containing pre-coating systems.
Such coatings become very brittle and it is difficult to lacquer such brittle coatings.
Furthermore, such coatings are only applicable to zinc and zinc alloys.
Another disadvantage is that these formulations cannot be stored.

Method used

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  • Silane-containing corrosion protection coatings
  • Silane-containing corrosion protection coatings
  • Silane-containing corrosion protection coatings

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0080]3 kg HS-1 is mixed with 97 kg water in a reactor. 100 g BYK 348 (BYK-Altana) is added to the mixture.

[0081]A steel sheet (cold-rolled milling) is dipped into the mixture for 2 minutes. The coating is dried with forced air at 60° C. for 5 minutes.

example 2

[0082]1 kg HS-2 is mixed with 20 kg water in a reactor. An aluminum sheet is coated using a squeegee (4 μm) and dried with forced air at 60° C.

example 3

[0083]15 kg HS-2 is mixed with 300 kg water in a reactor. A cold-milled steel sheet is dipped into the mixture and the rendered coating is dried with forced air at 60° C.

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Abstract

A metal surface can be corrosion protected by coating a corrosion protection composition on the metal surface, thereby obtaining a coating; and curing said coating at a temperature of from 20 to 120° C., to obtain a cured coating; wherein said corrosion protection composition comprises a condensated and hydrolyzed oligomer and / or polymer of at least one functionalized silane.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a low temperature curing process for silane-based compositions and their use as corrosion protection coatings.[0003]2. Discussion of the Background[0004]Corrosion damages of metal materials and metal parts are of significant economic importance. Corrosion protective coatings are applied to protect corrosion sensitive parts, used, for example, in construction, automobile industry and household. Conventional coating systems comprise several individual layers, typically the layers are on metals, and in particular “heavy” metals, e.g. chromium, nickel, arsenic, cobalt and zinc are often part of such coating. These metals have health and ecological risks, and thus alternatives are being searched.[0005]Silanes have been tested as possible substitutes for traditional pre-treatments of metal surfaces and more specifically to substitute Chrome VI. Silanes react with many inorganic surfaces, e.g. ...

Claims

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Application Information

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IPC IPC(8): B05D3/00
CPCC08G77/12C08G77/16C08G77/26C08L83/04C09D4/00C09D5/08C08L83/00
Inventor MORILLO, RAMON SANCHEZSIMOES, DORIS
Owner EVONIK DEGUSSA GMBH